Filter.



A. 'ENDLER.

FILTER.

APPLICATION FILED APR.21.1909y (1) O O O O Q) O O Patented Aug. 3, 1909.

ZSHEETS-SHBET 1.

A. ENDLER.

FILTER.

APPLICATION FILED APR. 21.1909.

930, 1 67. Patented Aug. 3, 1909.

2 SHEETS-SHEET 2 Fig 2 u "@@ge @ze i the solid filtering ALBERT ENDLER, OF CELLE, GrIiiRMiANY.l

FILTER.

speeincationfof Letten; Patent.

Application led April 21, 1909. Serial No. 491,261.

rae-enna aug. e, 1909.

To all whom ttmay concern: A

Be it known that I, ALBERT ENDLER, a subject ofthe Em eror of Germany, residing at 8b Kleine He lenerstrasse, Celle, Germany, have invented certain newandl useful Improvements in Filters; and I do hereby declare the following to be a full, clear, and exact description'of the invention.

My invention relates to filters and a primary object is to provide improved ltering apparatus having solid filtering bodies'and means for readil `cleaning the same.

When liquids lter-` through solid filtering bodies composed of porous porcelain, clay, kieselguhr and asbestos, or other artilicial stones, whose pores are so fine that the impurities do not penetrate deeply into the ltering mass, the impurities are' deposited on the surface of the filtering bodies in an impermeable layer, but alsol penetrate like plugs into the-pores of the outermost surace. For completely restoring the original 'efficiency of solid filtering bodles it is therefore necessary, that, firstly, the filtering mass shall have only that degree of hardness which permits a portion of slight thickness to be removed each time it is cleaned, and,l

consequently, that the surface be ,renewed each time of cleaning. It will be readily understood that this slight removal of the material and renewal of the surface is not to be' obtained by simplefcounter-pressure. Also .heretofore in those lilters inwhich air or water under pressure was forced through bodies in a directionopposite to that of filtration, the filtering bodies frequently had to be removed and cleaned by abrasion. Therefore they cannot be cleaned perfectly by counter-rinsing alone., None of the numerous mechanicall cleaning devlc'es have proved successful 1n practice.

Inthe improved apparatus described hereinafter the dirt is removed and the surface Arenewed by surrounding the filtering bodies with a layer of loose sharp-edged material,

for example sand, gravel, ground slags, glass, porcelain, small pieces of coal and the like, and by imparting an eddying motion to this surrounding material after liltrationis finished, using fdr that purpose `compressed air which is blown under pressure directly into the cleanin material through nozzles arranged outside the filtering body. In this manner the individual particles are thrown vmo'vably or permanenti vcase G of the filter. T e cylinders are surwith force against the walll of the filtering body and carry away the mud settled there whlch 1s removed simultaneously from the apparatus by rinsing with water. The loose material exercises on the filtering cylinder a grinding action, likethat of a sand blast and in this manner renews the surface. For aiding the action the interior of the filtering cylinder can be exposed to pressure, for example of an', water or steam, in addition, 1n a manner known heretofore, and or the like under pressure endeavoring to pass out through the pores of the iiltering mass loosens -the layer of ooze or mud deposited on the surface of the liltering cylinder, so that this layer canbe more readily removed by the impact of the surrounding loose particles.

In the present apparatusthe perforated, fixed or movable plate used in the well;

the air known Berkefeld filter for example, to

which plate the filtering cylinders are attached, is replaced by a perforated double plate, whose holes serves for attaching the respective cylinders. The plate lying next to the tilterlng cylinders themselves is provided in addition with a number of somewhat fine perforations or nozzles, from which alone the air, introduced under pressure into the space between' the two plates, can escape. l

In order that my invention may be clearly understood I will now describe the same with reference to the accompanying drawing in which several embodiments are represented by way of example.

In said drawings, Figure l is a vertical sectional elevation through one form of my improved filter, and F lgs. 2 and 3 are a vertical sectional elevation, and a horizontal section approximately on the' line A'-B in Fig. 2, respectively, of a modified form.

Fig. 4 is a vertical sectional elevation and Fig. 5 an underside plan view of an individual filtering body on an enlarged scale, the plane being indicatedby the line 5-5 of Flg 4. Re erring to the drawing, and firstly particularly to Fig. 1, a constructional form of the ap aratus is here shown which is possible wlien only a few ilteringcylinders are em lo ed. The filtering cylinders A are attacliedy to adouble 'plate B which may be rcconnected with )the i rounded by a Shar -edged material D. The

top and bottom ates or disks comprising the double plate are provided with holes E in which the discharge pipes E of the cylinders are'tted tightly by means of nuts .P and india-rubber rings O as clearly shown. The top disk of the double late has in addition the fine orifices or nozz es F. The water to be filtered enters in known manner into the filter through the pi e K, penetrates the porous cylinder A and ows off lthrough the pipe H. Compressed air'from an air com presser enters under pressure through the gipe G into the chamber in the double plate rises through the nozzle F and imparts to the material D an eddying motion.

Owing grinding action on the surface of the filtering cylinder takes plac, the mud de osited .thereon is parried away and remove the. apparatus by rinsing water which .flows in throughthe pipe K, while the air escapes through the outlet L. When desired the cleansing action can beincreased by allowing compressed air, water or steam under pressure to pass through the pipe H into the chamber I' between the bottom cover C of the case and the double plate, thence through the' pipes E1 into the chambers M in the filtering cylinders and then through the porous 'walls of the latter. Inv this manner the mud deposited on the surface of the filtering cylinders is loosened. f

In a filter containing a somewhat large number of cylinders a large qila'ntty of cleaning material would be required to fill the spacesbetween the filtering bodies, and the pressure required to set the entire weightA of the cleaning material into uniform motion suiicient'for the desired purpose would be enormous.

' In one form of the apparatus (Fi s.'2 and 3) designed .to overcome these di culties, a jacket is placed around each single ilterin body. The space between the jacket and filtering body 1s made only so large ythat just the necessary quantity of cleaning material has room andk can move freely. Owing to this arrangement the cleaning material when set in motion is forced to movein a certain direction, in this way scourin the lterin cylinder and causing the irt collecte thereon to be rubbed away, the latter being then removed from the apparatus by rinsin water which is simultaneously supplie thereto. By means of a peculiar shape and arrangement of the 'ackets around the individua filtering bo ies, it is simultaneously ossible to control the effectiveness of the invidual'cylinders while working, and 'to exchange any which possibly may have been injured, without it being necessary to dismember the entire apparatus or to remove all the purifying material from it.- At the same time a peculiar arrangement of slits and nozto the impact of the particles,. av

mixtures of. liquid an ancy imparts a violent the granular material. On account of the zles and a very special form of washers allow theiuniform distribution of the compressed air forced into the apparatus.

Figs. 2 and 3 show the arrangement of a somewhat large number of ilteringbodies in a common case, and the arrangement ofl the jackets surrounding each individual filtering body, and that of the slots and nozzles andtheform of packing. For the sake of distinctness one single filtering body is shown on an enlargedV scale in Figs. 4 and the plan View in Fig. 5 showing the face of the joint. Each filtering body A is packed tightly in' known ymanner with a washer AO and nut P in the bottom Q of each individual surrounding jacket R. The bottom of the jacket has an annular extension S which can be passed through holes in the double bottom B forming the air adinissioniv chamber, the india-rubber ring T? T2 and nut U making atight joint.

The bottom of the jacket contains, besides tliehole for 4the discharge pipe E1 of theI filtering cylinder, a number of nozzles F, and the under side is cut away to receive a packin plate T1 T2 which, owing'to segment-li e incisions, has the form of'twg concentric rings connected by a number gf radial bars. Y

Fig. 5 is a bottom plan view showing the bottom of the jacket and simultaneouslythe peculiar form of the packin plate lhaving the concentric rin ST1 and 2 connected by the radial bars In the segmental `incisions the nozzles F are indicated and also the position of the slots W'by dotted lines.

It is evident that owing to their len s the slots W can never becovered over, ut will always register with two of the nozzles and will secure a; uniform distribution of the compressed air. l

- The apparatus works as follows -The water to be filtered, which enters throu h the socket K, passes throu h the holes in t e upper end of the jackets onthe ltering cylinders and through the wall of which it is forced by `the pressure of the main or pump. \The filtered water flows through the socket S into the chamberl in thejbottom'of the a paratus (Fig. 2) and isfled away thence t ough the socket H. The impurities remain on the surface of the cylinders A.' When tlie latter have become clogged to such an extent thatsuiiicient lwater is no longer filtered, filtration is (gas, Steam, water or gaseous substancesstopped; air or other are then introduced under pressure through Vthe pie G to the chamber .3. The compresse air &c. is forced through the slots W and nozzles F .into the material D surrounding Ailtering cylinanular scouringl tire ders A and owing to its ex ansion and buoydying motion to jackets the particles cannot escape laterally l but must move over the faces of the filtering l bodies. In this manner the ooze or mud settled on the surface of the filtering bodies l is removed and simultaneously7 the filtering l cylinder is scoured and ground so as to renew its surface. The packing rings T1 T2 prevent the pressure medium introduced for moving the cleaning mass from escaping laterally and also prevent filtered and non-V filtered water mixing.

I claim:

1. In a filter, the combination of an outer case having an inlet, with a perforated. doui ble plate inclosing a chamber having an inlet attached to said case, a hollow filtering meml ber in said case and attached to said double plate, loose granular material between said member and the case, the perforations in said double plate connecting the chamber in the same with the space between said member and the case, as set forth, for the purpose specified.

2. In a filter, the combination of an outer case having an inlet, with aperforated double plate inclosing a chamber having an inlet attached to said case, a hollow filtering member in said case and attached to said double plate, a jacket fitting said double plate and surrounding said member, loose granular material between said member and the jacket, the perforations in said double plate connecting said chamber with the space between said member and said jacket, as set forth, for the purpose specified.

3. In a filter, the combination of an outer case having an inlet, with a perforated double plate inclosing a chamber having an inlet attached to said case, a hollow filtering member in said case, a jacket fitting and attached to said` double plate and surrounding said member, said jacket having a bottom provided with nozzles attached to said double plate, means attaching said member to the bottom of said jacket, loose granular material between said member and said jacket, and a packing ring having segmental incisions registering with said nozzles and the perforations in said double platethe\ perforations in said double plate connecting the chamber in the same by way of said nozzles with the space between said member and said jacket, as set forth.

4. In a filter, the combination of a perforated double plate inclosing a chamber, a jacket attached by its bottom to saidplate, the bottom of said jacket having nozzles corresponding with the perforations in said plate, anda packing plate having segmental incisions arranged, substantially as shown, between said plates and the bottom of the j aeket, for the purpose specified.

In testimony that I Yclaim the foregoing as my invention I have signed my name in presence of two subscribing witnesses.

ALBERT ENDLER. Vitnesses:

ROBERT J. THOMPSON, LUIsE KATHER. 

